ALMEIDA, D. A. R.; http://lattes.cnpq.br/8811910446558352; ALMEIDA, Denise Ágatha Rodrigues.
Abstract:
Acoustic tomography of cores can be rather useful on identification and
quantification of several petrophysics attributes. Time-traveling tomography
technique involves the inference of local acoustic velocity from the time of
traveling of waves between a large number of pairs source-receiver. With aim of
analyze the special distribution of acoustic velocities in well cores, it was
simulated a system to execute elastic tomography in cores, comprising a model
of CT scanner and a set of computational programs developed to detected the
first wave arrival times, invert all data acquired from the CT scanner and
generate the velocity maps (tomograms). In this model, the transducers perform
data acquisition with a dynamic positioning in 36 different positions over the
sample perimeter. This assembly of data acquisition result on the register of
684 traces for each tomogram. Inversion programs used to generate the
tomograms have been tested in models of cores simulated synthetic and
numerically whose expected tomograms are previously known. The Inversion
programs are proving able to reproduce, approximately, the theoretical models
of cores, although there is a limitation given by the partial assumption that the
trajectory of the rays occurs linearly.